Question 14b

fig 1 total → 2 + 3 = 5 fig 2 total → 4 + 5 = 9 fig 3 total → 6 + 7 = 13 fig 4 total → 8 + 9 = 17

figure 1 total → 5 figure 2 total → 5 + 4 = 9 figure 3 total → 9 + 4 = 13 figure 4 total → 13 + 4 = 17

adding number → 4 starting number → 5

formula if adding number is the same

starting number + adding number x (figure number - 1) → 5 + 4 x (10 - 1) = 41